Finding the Fourth Proportional to 20,332.42, 28,076.06 and 12,791.37

Step by Step Solution

1. Step 1: Write the proportion equation
   20,332.42 : 28,076.06 = 12,791.37 : x
2. Step 2: Convert to fraction form
   20,332.42/28,076.06 = 12,791.37/x
3. Step 3: Cross multiply
   20,332.42x = 28,076.06 × 12,791.37
4. Step 4: Simplify right side
   20,332.42x = 359,131,271.60
5. Step 5: Solve for x
   x = 359,131,271.60/20,332.42
6. Step 6: Final answer
   x = 17,662.99